Biological Control Branch Station

Application of intergrated control technology for diseases and pest insects in strawberry


Healthy seedlings are the foundation of successful strawberry cultivation. In recent years, an epidemic of the strawberry Anthracnose affect strawberry cultivation area that increase farmers' production costs. Our project used the seedbed that had got diseases last year to carry out nursing experiment. The result showed that seedlings grew normally in early stage and began to grow vines in mid-April. The mother plant started to die in early May because the root cap was infected by Anthracnose. The death rate reached 30% in early June and had reached 61.67% in the end of June. the strawberry were also covered with Anthracnose spot on runner. This nursery was not suitable for nursing seedlings any more. Using recommended chemicals in recent years to inhibit anthrax pathogen. The three chemicals pharmacies includes difenoconazole, pyraclostrobin and azoxystrobin as recommended control chemicals for Anthracnose were conducted with 3000x, 1500x and 1000x under 25℃ and 12hr in potato dextrose agar cultivation for two weeks.

The results showed that difenoconazole in three different concentrations were all have significantly inhibitory effect. Farmers usually use azoxystrobin, but its antibacterial effect was not effective. The 1000 times of concentration its plaque diameter under 1000x of azoxystrobin was similar to the control. Pyraclostrobin have bacteriostatic effect, but its effect is weaker than that of difenoconazole. The higher concentration of difenoconazole was more antibacterial effect than that of the lower concentrations.

strawberry mother plant death percentage in 2013 and inhibit effect of three chemicals on strawberry anthracnose